| 单词 | D meson |
| 释义 | D meson [¦dē `mā´sän] PARTICLE PHYSICS 1. A neutral pseudovector meson resonance having a mass of 1285 ± 4 MeV, width of about 30 MeV, and positive charge conjugation parity; the only singlet state consistent with the (1+)+ nonet. 2. Collective name for three charmed mesons that form an isotopic spin triplet, have masses of approximately 1865 MeV, and are pseudoscalar particles. |
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